object ScalaVarDemo011 {
    def main(args: Array[String]): Unit = {

      var num: Int = 10

      println(num.toDouble + "\n" + num.toString + "\n" + 10.toString)

      var isPass = true
      println(isPass.toString)

      sayHi()
      sayHi
    }

    def sayHi(): Unit = {
      println("say hi~")
    }

}
